Safety device for cranking explosive-engines.



R. O. BUSBEY.

SAFETY DEVlCE FOR CRANKING EXPLOSIVE ENGINES.

APPLICATION FILED APR. 1!. 1917.

1,235, 107, v Patented July 31, 1917.

Ml lzlllHTl avwemlol K O BusBEY' ROBERT OLIVER BUSBEY, OF HAUGHTON, LOUISIANA.

SAFETY DEVICE FOR CRANKING EXPLOSIVE-ENGINE-S.

Application filed April 11, 1917.

To all whom it may concern:

Be it known that 1, ROBERT O. BUsBnY, a citizen of the United States, residing at Haughton, in the Parish of Bossier and State of Louisiana, have invented certain new and useful Improvements in Safety Devices for Cranking ExplosiveEngines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to certain improvements in safety devices for cranking explosive engines and it is an object of the invention to provide a novel and improved device of this general character which serves to eliminate the danger arising from a back fire of the engine.

It is also an object of the invention to provide a novel and improved device of this general character comprising a yieldably mounted member serving to connect the crank to the engine shaft, said yieldable member possessing sufficient resistance to lock the crank shaft during the cranking operation but permitting the engine shaft to turn backward independently of the crank in the event of a back fire of the engine.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved safety device for cranking explosive engines whereby certain important advantages are attained and the device is rendered simpler, less expensive and otherwise more convenient and advantageous for use, all as will be hereinafter more fully set forth.

The novel features of the invention will hereinafter be definitely claimed.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein Figure l is a view in top plan of a safety device for cranking explosive engines constructed in accordance with an embodiment of my invention, the coacting drive shaft being shown in fragment; and

Fig. 2 is a view partly in elevation and partly in section of the device as herein embodied.

As disclosed in the accompanying drawings, 1 denotes a cuff or sleeve loosely mounted upon the drive shaft 2 of an internal combustion engine. The cuff or sleeve 1 is capable of independent endwise movement upon the shaft 2 so that said sleeve or Specification of Letters Patent.

Patented July 31, 1917.

Serial No. 161,347.

cufl may be coupled with or disengaged from the shaft 2 in a conventional manner.

Fixed to the outer end portion of the cuff or sleeve 1 is a ratchet wheel 3 which is positioned between the spaced arms 4 of the crank C. The arms 4 are loosely engaged with the outer end portion of the cufi or sleeve 1 so that the crank C and sleeve or cuff have relative independent movement.

Extending within the kerf- 5 afforded by the parallel arms 4 is a pivoted member 6 of such a width as to have a marginal portion thereof extending beyond a longitudinal margin of the crank C. The forward end portion of the pivoted member 6 is provided with a substantially V-shape notch 7 in which is disposed the resilient dog or detent 8 adapted to engage the teeth of the ratchet wheel 3. By this arrangement it will be self-evident that as the crank C is turned in one direction the coaction between the ratchet 3 and the dog or detent 8 will impart the requisite rotation to the sleeve or cufi 1, but in the event of a back fire the resiliency of the dog or detent S will readily permit a reverse rotation of the wheel 3.

The extended marginal portion of the member 6 has pivotally engaged therewith at opposite sides thereof the links 9 which in turn are pivotally engaged with the ex tension 10 of the clip 11. The clip 11 is substantially U-shape in form and straddles the lug 19 carried by a face of the crank and is pivotally engaged therewith.

Anchored to the crank C outwardly of the lug 12 is the resilient arm 14 constantly bearing against the clip 11 and urging the outer end portion thereof in a direction toward the crank C. The tension imposed upon the clip 11 by the resilient arm 14: is also imposed upon the outer end portion of the member 6 through the medium of the links 9 so that sufiicient resistance may be imposed upon the member 6 as to permit the crank C and ratchet wheel 3 to rotate in unison under normal conditions.

In order to regulate the tension of the resilient arm 14 I find it of advantage to employ the threaded member 15 disposed through the crank C and engageable with the inner face of the clip 11 adjacent the outer end thereof.

From the foregoing description, it is thought to be obvious that a safety device for cranking explosive engines constructed in accordance with my invention is of an on tremely simple and comparatively inexpensive nature and is particularly well adapted for use by reason of the convenience and facility with which it may be assembled, and it will also be obvious that my invention is susceptible of some change and modification without material departure from the principles and spirit thereof and for this reason I do not wish to be understood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice, except as hereinafter claimed.

I claim:

1. A device of the character described comprising, in combination with an engine shaft, a sleeve mounted upon the shaft, c0- acting means carried by the shaft and sleeve for locking the same for unitary movement, a ratchet wheel fixed to the sleeve, a crank loosely engaged with the sleeve, a member pivotally supported by the crank, a resilient dog carried by the member and coacting with the ratchet wheel, and means for imposing tension upon the pivoted member.

2. A device of the character described comprising, in combination with an engine shaft, a sleeve mounted upon the shaft, coacting means carried by the shaft and sleeve for locking the same for unitary movement, a ratchet wheel fixed to the sleeve, a crank loosely engaged with the sleeve, a member pivotally supported by the crank, a resilient dog carried by the member and eoacting with the ratchet wheel, means for imposing tension upon the pivoted member, and means for regulating said tension.

a ratchet wheel fixed to the sleeve, a crank loosely engaged with the sleeve, a member pivotally supported by the crank, a resilient dog carried by the member and coacting with the ratchet wheel, a second member pivotally engaged with the crank, a rigid link operatively engaged with both of the members, and means for imparting tension to the second member.

4. A device of the character described comprising, in combination with an engine shaft, asleeve mounted upon the shaft, co acting means carried by the shaft and sleeve for locking the same for unitary movement, a ratchet wheel fixed to the sleeve, a crank loosely engaged with the sleeve, a member pivotally supported by the crank, a resilient dog carried by the member and coacting with the ratchet wheel, a second member piv otally engaged with the crank, a rigid link operatively engaged with both of the mem bers, means for imparting tension to the second member, and means enacting with said second member for regulating the tension imposed thereon.

In testimony whereof I hereunto afi'ix my signature in the presence of two witnesses.

ROBERT OLIVER BUSBEY.

lVitnesses G. D. ENGART, J. M. FOSTER.

Copies of this patent may be obtained for five, cents each, by addressing the Commissioner of Patents, Washington, D. G. 

